being able to change direction quickly and with little to no resistance or force pressing against the direction change. Heavier or yoyos that have huge rim weight will have more inertia that will cause a slowed response of the reversal and more force during the transition. This same added inertia is exactly why they are more stable and have generally longer sleep times, at the cost of some loss of nimble behavior.

Stable - " not likely to give way or overturn; firmly fixed."

Being able to resist falling off axis due to hand strike or string hitting the sides of the yoyo. A yoyo with high stability will usually have high rim weight or also likely found in Bi Metals. There are a few BiMetals that have big rim weight, but are still fast and nimble. Most of the time you are on a sliding scale. As you favor stability, you lose nimble, and vise versa. While this isnt always the case is a general rule of thumb.

Floaty - A can of worms that is sticky and muddy.

A feeling of especially lightness. If a yoyo feels heavy in your hand while your holding it, but light on the string, it can be called floaty. If a yoyo is exceptionally nimble, one might be inclined to call it floaty. If one is misinformed, one might say a floaty yoyo gives you more time during hops and pops but this is not the case. You will hear this term thrown around alot, but it is too subjective and personal to nail down 100%. After being into it for a while now, I never think “wow, this yoyo is so floaty!” but rather “it feels so light on the string!”

How I see it, it’s like describing a square and a rectangle. A square is a rectangle, but not all rectangles are squares, right? Same with fast and nimble. Nimble yoyos are usually fast due to their relatively high center weight and light weights. This allows them to play fast and nimble. However, not all fast yoyos are nimble. Some yoyos can play fast but due to their inertia, you can’t make them switch directions easily. These yoyos may move fast because of their light weight and how air flows over the profile.